Development of Breathing

Development of Breathing - Development of Breathing oxygen...

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Development of Breathing oxygen diffusion - way for gases to get across plasma membranes levels needed for metabolism can’t be obtained by diffusion over 0.5 mm respiratory organs increase surface area and decrease distance over which oxygen must move gills - tissue that projects out into the water has no support, would collapse w/o water loses lots of water to evaporation when exposed to air external gills - not enclosed within the body o must be constantly moved o easily damaged o branchial chambers - pumps water past nonmoving gills bony fish gills - found between mouth and opercular cavity o most efficient of all respiratory organs o operculum (gill cover) - moves to open/close opercular cavity o water moves in through mouth, leaves through operculum o ram ventilation - forces water over gills through body mov’t, not pumping o gill arches - 4 on each side of head, each contains 2 rows of gill filaments and lamellae o blood flows opposite to the water mov’t (coutercurrent)
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Development of Breathing - Development of Breathing oxygen...

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